BRASS RECESSED HEX HEAD PLUG 1/4 S219P-4

This brass recessed hex head pipe plug threads into a 1/4in NPT port to seal off an unused air, fuel, or fluid line connection on a heavy-duty truck. The recessed hex socket sits flush with the fitting body so it won't snag on hoses, wiring, or nearby components, and it's driven with a standard hex key rather than a wrench. Cross-reference: S219P-4.

Solid brass construction resists corrosion and holds a tight seal under vibration, making it a reliable choice for air brake manifolds, fuel systems, and hydraulic ports on Kenworth, Peterbilt, Freightliner, International, Mack, and Volvo trucks. United Truck Parts keeps this plug in stock at our Pennsylvania warehouse for fast shipping along the I-78 corridor — reach out for fitment help or fleet pricing.